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Anti-B23 antibody, Mouse monoclonal

clone FC82291, purified from hybridoma cell culture

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Anti-NPM, Anti-Nucleophosmin
MDL number:

biological source


Quality Level



antibody form

purified immunoglobulin

antibody product type

primary antibodies


FC82291, monoclonal


buffered aqueous solution

mol wt

antigen 37 kDa

species reactivity

rat, kangaroo rat, canine, bovine, human, mouse, monkey, hamster


antibody small pack of 25 μL


~0.5 mg/mL


immunocytochemistry: suitable using 2% formaldehyde-acetone or 10% formalin/methanol-1% NP-40
immunoprecipitation (IP): suitable
indirect ELISA: suitable
western blot: 0.2-0.4 μg/mL using a whole extract of 3T3 (mouse fibroblasts) cells



UniProt accession no.

shipped in

dry ice

storage temp.


target post-translational modification


Gene Information

human ... NPM1(4869)
mouse ... Npm1(18148)
rat ... Npm1(25498)

General description

B23 (also known as NPM, nucleophosmin, numatrin or NO38) is a phosphoprotein, widely expressed in all cell types, and localized in granular regions of the nucleolus associated with pre-ribosomal particles. This protein was found to be involved in several nuclear functions such as assembly and/or intranuclear transport of preribosomal particles, cytoplasmic/nuclear trafficking, regulation of DNA polymerase A activity and centrosome duplication. Phosphorylation of B23 is mediated by a cyclin complex, CDK2/cyclin E.
Phosphorylation causes the dissociation of B23 from the centrosome and enables the duplication of the centrosome during cell mitosis. B23 was also found to be involved in pro-myelocytic leukemia in which the gene for B23 fuses with retinoic acid receptor a (RARa). As a consequence, a fusion protein (60-7 0 kDa) is produced containing parts of the two genes.


It detects both the phosphorylated and the unphosphorylated B23 molecule. The epitope recognized by the antibody lies within the 68 amino acids at the C-terminus of B23.


rat B23 (nucleophosmin, NPM, numatrin).


The antibody may be used for ELISA, competitive ELISA, immunoblotting (37 kDa), immunoprecipitation, immunocytochemistry (2% formaldehyde-acetone 1,2,5 or 10% formalin/methanol-1% NP-40 and microinjection (blocks the initiation of centrosome duplication) and immunohistochemistry. Reactivity has been observed with human, monkey, bovine, dog, hamster (weak), rat,kangaroo rat, and mouse B23.

Physical form

Solution in 0.01 M phosphate buffered saline, pH 7.4, containing 1% BSA and 15 mM sodium azide.

Preparation Note

Purified from culture supernatant of hybridoma cells grown in a bioreactor.


Unless otherwise stated in our catalog or other company documentation accompanying the product(s), our products are intended for research use only and are not to be used for any other purpose, which includes but is not limited to, unauthorized commercial uses, in vitro diagnostic uses, ex vivo or in vivo therapeutic uses or any type of consumption or application to humans or animals.

Storage Class

12 - Non Combustible Liquids




Not applicable


Not applicable

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The linker histone H1. 2 is a novel component of the nucleolar organizer regions
Junjie C, et al.
The Journal of Biological Chemistry (2018)
Dynamic localization of alpha-tubulin acetyltransferase ATAT1 through the cell cycle in human fibroblastic KD cells
Nekooki-Machida, et al.
Medical Molecular Morphology, 1-10 (2018)
Katharina Thanisch et al.
Nucleic acids research, 42(6), e38-e38 (2013-12-29)
Epigenetic regulation of gene expression involves, besides DNA and histone modifications, the relative positioning of DNA sequences within the nucleus. To trace specific DNA sequences in living cells, we used programmable sequence-specific DNA binding of designer transcription activator-like effectors (dTALEs).
Carmen Dominguez-Brauer et al.
Cell stem cell, 19(2), 205-216 (2016-05-18)
The E3 ubiquitin ligase Mule is often overexpressed in human colorectal cancers, but its role in gut tumorigenesis is unknown. Here, we show in vivo that Mule controls murine intestinal stem and progenitor cell proliferation by modulating Wnt signaling via c-Myc.
Rachel Hiu Ha Ching et al.
Oncotarget, 6(41), 43483-43495 (2015-11-05)
Hepatocellular carcinoma (HCC) is frequently complicated by the occurrence of intrahepatic and extrahepatic metastases, leading to poor prognosis. To improve the prognosis for HCC patients, there is an urgent need to understand the molecular mechanisms of metastasis in HCC. Since

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